Mechanistic Investigation of Photon Upconversion in Nd3+-Sensitized Core鈥揝hell Nanoparticles
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- 作者：Xiaoji Xie ; Nengyue Gao ; Renren Deng ; Qiang Sun ; Qing-Hua Xu ; Xiaogang Liu
- 刊名：Journal of the American Chemical Society
- 出版年：2013
- 出版时间：August 28, 2013
- 年：2013
- 卷：135
- 期：34
- 页码：12608-12611
- 全文大小：332K
- 年卷期：v.135,no.34(August 28, 2013)
- ISSN：1520-5126
文摘
A new type of core鈥搒hell upconversion nanoparticles which can be effectively excited at 795 nm has been designed and synthesized through spatially confined doping of neodymium (Nd3+) ions. The use of Nd3+ ions as sensitizers facilitates the energy transfer and photon upconversion of a series of lanthanide activators (Er3+, Tm3+, and Ho3+) at a biocompatible excitation wavelength (795 nm) and also significantly minimizes the overheating problem associated with conventional 980 nm excitation. Importantly, the core鈥搒hell design enabled high-concentration doping of Nd3+ (20 mol %) in the shell layer and thus markedly enhanced the upconversion emission from the activators, providing highly attractive luminescent biomarkers for bioimaging without autofluorescence and concern of overheating.